Permanganate ion
Charge: 1- · Type: Polyatomic anion · Molar mass: 118.934 g/mol
Made of: manganese, oxygen
How it forms
Manganese in its +7 oxidation state bonds to four oxygens in a tetrahedron. The intense purple color comes from electrons moving between oxygen and manganese when light hits the ion.
Naming note
MnO4- is the permanganate ion. Manganate (MnO4^2-) is a different, green ion of manganese in the +6 state.
Examples in compounds
Potassium permanganate
Sodium permanganate
Calcium permanganate